Electric switch



Aug. 16, 1927.

T., A. PANGBURN ELECTRIC SWITCH Filed Dec. 11, 1923 gwuentu 77/7. Pazfiburn imam, I

a ,0: III I I Patented Aug. 16,1927. v

UNITED; STATES I 1,639,1Si7

mammalian. rA eBuRmor CAMD N, New massif.

' IELECTRIC swmca or ginal application flied hecember il,"15921,FSeriaI'No. 519, 168. Divided andthis application filed v c December-'11, 192's. -Seria1'N'o;680,022. I

This invention relates to an improved electric switch, the invention being divided outof my co pending 'application forburglar alarm, filed December'2, 1921,'Serial No. 519,463. j

The invention seeks to provide a changeover's'witch p'articularlyadapted foruse in conjunction with a closed circuit alarm system, as described in my prior application herein identified and wiherein, when the switch member of the device is released, said member will be automatically shifted for breaking one circuit and closing another.

In the accompanying drawings:

Figure 1 is a perspective view of the switch plate employed and switch assembly,

Figure 2 is a fragmentary perspective view showing the switch in detail,

' Figure 3 is a detail sectional view showing the adjustable contact screw.

In carrying the invention into efiect, I. employ a base plate which may be of suitable insulating material and appropriately secured to said plate is an angle bracket 11. Pivoted upon said bracket is a switch member 12 having a substantially triangularshaped body and projecting from opposite edges of the body at the base end thereof are oppositely directed arms 13 and 1 1', the switch member thus being doubleended. Pivotally connecting the switch member with the bracket is a bolt or other suitable fastening device 15 extendlng through the body of the member near the lower end thereof and formed on the free end of the arm 13 of said member is a hook 16. Journaled at one end through the smaller end of the bodyof the switch member at a point slightly displaced with respect to the plane of the bolt 13, is a link 17 which extends beneath the switch and coacting with the opposite end of the link is a flat spring 18 secured at one end to the plate 10. Similarly secured at one end to the plate to cooperate with the spring 18 isan auxiliary spring 19, the free end of V which bears over the free end portion of the spring 18, and mounted upon the plate 10 in the angle between said springs is a wear strip 20. V Extending'through the plate 10 is a contact post 21 threaded through the wear strip, this post being disposed to cooperate with the free end of the arm 13 of the switch member. As brought out in Figure 3, the post maybe adjusted for vary ing the throw of the switch member when swung-forwardly and carries a lock nut 22 for securing the .post in adjusted position. lslo mtedupon the plate 10 to cooperate with the arm 1% of the switch member is a contact post 23. andremovably threaded into the. smaller end of the body. of said member isalever24 mounting a knob 25 which may bet-grasped for. swinging the switch member.

jArranged upon theplate 10 near one end thereof is an electro-magnet 26, the terminals of the windings of whichare secured to binding posts 27, and disposed to cooperate with oneencl ofthe magnetis anrarmature 28. This armature is mounted upon one end of a lever 29 pivoted upon a plate 30 and formed on the lever at its opposite end is a hook 31 engageable with the hook 16 of the switch member 12. In use, the magnet 26 is normally energized so as to attract the armature 28 for holding the hook 31 in the, path of the hook 16 and, as will be observed the outer face of the hook 31 is beveled. Accordingly,.when the switch member 12 is swung forwardly for setting the switch, the hook 16 will ride over the hook 31 to engage therebeneath coacting with the post 21, the lever 29 being, of course, coincidently rocked. Connected to said lever near the rear end thereof is a spring 32 for swinging $5 the lever to release the switch member 12 when the magnet 26 is tie-energized. When this occurs, the spring 18 will immediately rock the change-over switch to engage the arm 14 thereof with the post 23 closing a circuit therethrough. As set forth in my prior application previously identified, the magnet 26 isincluded in a circuit with an appropriate circuit breaker while the post 23 is included in a circuit-with a suitable annunciator. Accordingly, as will be seen, as long as the circuit breaker remains closed .and the magnet 26 is energized, the switch member 12 will be held' in set position. However, when the circuit breaker is actuated and the circuit through the magnet is broken, the switch member will be released and automatically rocked to engage the post 23 when the circuit through the annunciator will be closed for sounding the annunciator, which annunciator will: then continue to sound until the switch member 12 is manually rocked out of engagement with the post 23.

Having thus described the invention, what 1 is claimed as new is 1. An electric switch including a base, a

contact carried thereby, a pivoted switch member mounted in a plane at an angle to the base, a link pivotally engaged at its upper end with said switch member at a point above the pivotal center thereof and extending downwardly past said member toward the base, a spring fixed to the base and having its free end engaged with the lower end o't' said link to press downwardly thereon for rocking the switch member in one direction into engagement with said contact or in the opposite direction out of engagement with said contact, a lever pivoted upon the base to lie substantially parallel thereto an'd'rock in a plane intersecting the plane of the switch member and provided with a hook engageable with said switch member for holding said member in engagement with said contact, and means for swinging the lever and releasing the switch member.

2. An electric switch including a base, a contact carried thereby, a pivoted switch member mounted in a plane at an angle to the base, a link pivotally engaged at its upper end with said switch member at a point above the pivotal center thereof and extending downwardly past said member toward the base, a spring fixed to the base and having its free end engaged with the lower end of said link to press downwardly thereon for rocking the switchinember in one direction into engagement with said contact or in the opposite direction out oi engagement with said contact, said switch member being provided with an inturned hook, a lever pivoted upon the base to lie substantially parallel thereto and rock in a plane intersecting the plane of the switch member and provided with a hook engageable with said first mentioned hook for holding the switch member engaged with said contact, and means for swinging the lever and releasing said switch.

In testimony whereof I afiiX my signature.

TRUMAN A. PANGBURN. [Ls] Ill) 

